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W. J. MUNOASTER. TOOL HOLDER AND CARRIER.

No. 605,504. Patented June 14,1898.

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(No Model.) 3 Sheet-$heet 3.

W. J. MUNUA'STER. TOOL HOLDER AND CARRIER.

Patentd June 14, 1898.

, UNlTlED F r-arias WALTER J. MUNOASTER, or CUMBERLAND, MARYLAND,Assieuon on oun- HALF TO THE CUMBERLAND IRON AND STEEL SHAFTING COMPANY,or

SAME PLACE.

Tool. HOLDER on CARRIER. i

srnorrron'rron forming m of Letters Paar No. 605,504, dated June 14,-1898.

Application filed August 31', 1897. se ant. 650,190. (No model) To allwhom it may concern:

Be it known that I, WALTER J. MUNCASTER, a citizen of the United States,residing at Cu mberland, in the county of Alleghany and State ofMaryland, have invented certain new and useful Improvements in ToolHolders or Carriers, of which the following is a specification. Myinvention pertains to a tool holder or carrier for use in connectionwith lathes, and is designed to maintain the cutting or operating toolin contact with and in proper relation tothe work despite the vibrationthereof.

Figure 1 is a transverse section of the bed or frame of a lathe, showingthe tool holder in side elevation; Fig. 2, a front elevation of thesame; Fig. 3, a side elevation showing the device in a modified form;Figs. 4: and 5,views of the guiding or bearing roller in slightlyvaryingbut equivalent forms; Fig. 6, a perspective view of, the frame or leverwhich carries the roller and the tool, showing fric-.

tion-clamps for the stems of the roll-bearing yokes.

The device herein set forth is designed for the work of finishing smallshafting or other cylindrical bodies of comparatively small diametersubject to considerable vibration, and it may be used in connection withor independently of tools adapted to make a heavier out, as foundexpedient. A Ordinarily I have found it convenient to use itsimultaneously with such other cutting or reducing tools, but to locateit at such point as to cause it to operate upon that portion of theshafting or other body already treated by such other tools.

Referring first to Fig. 1 of the drawings, 1 indicates the bed of alathe having at its top the usual ways to support and guide a slide 2,which may be moved lengthwise of said bed by a pinion 3, carried by aspindle 4, j our ed the usual'cross-slide 7 with its tool-post 8, andthe usual devices for adjusting the same.

9 indicates a frame or lever pivotally supported upon the side of theslide 2 at a point preferably directly below or in vertical planeencircled beneath said flange 12 by a spiral spring 13, beneath whichare placed a washer 14 and nut 15, as shown in Figs. 1 and 2. The

nut, screwing upon the threaded end of the rod, enables the operator tovary the compression' of the spring 13, which spring tends constantly todraw downward the tail or extension 10 and to hold it in contact withthe flange 12 of the slide.

Mounted upon and arranged to slide across the top of the forward arm oflever 9 is a slide 16, provided with an adj Listing-screw 1i and bearingat its top a tool-holder 18,'here represented as a post, designed oradapted to carry a chisel or cutter 19. Instead, however, ofthetool-post the holder may be simply a support for a grinding orabrading tool, to which motion may be given from any convenient source.

The rear arm of the lever 9 extends upward from its pivot at an angle ofapproximately forty five degrees, thence upward and for- Ward to a pointabove the horizontal axis of the lathe-spindles, and consequently abovethe work extending between the spindles. This rear arm of the lever 9 isprovided with two .bosses or enlargements 20 and 21. Through the boss 20is passed a cylindrical stem 22, terminating at its inner end in a yokethe proper pointrelatively to the work held in the lathe, and it isclamped at the desired adjustment by a set-screw 25 or is otherwise madefast.

Through the boss 21 is passed a smaller cy- The roller 21 is arranged tobear upon the shafting or work 29 at a point opposite that at which thetool 19 makes contact therewith, or substantially so, while the roller27 bears at apoint about midway between the bearingpoints of the tooland the roller 24; but the roller is arranged slightly out of Verticalplane with the cutting-tool, so that it may bear upon a surface alreadydressed by the tool, as seen in Fig. 5. From this description it will beseen that if the shaft or other work 29 spring either upward or backwardit will, by reason of its bearing against the rollers 27 and 24:, swingthe lever 9 about its pivot andcause the tool 19 to follow the work andto maintain its proper relation thereto, while if the vibration betoward the tool the tool may recedeslightly, being drawn back by theaction of spring 13 until the tail or extension 10 bears upon the rib12.

The tool and roller constitute, in effect, a

calipering device, insuring great uniformity in diameter and truecircular form.

The tool 19 is designed onlyfor giving-the final finish, smoothness, orpolish to the work and is set to take avery light out; but it is foundin actual use that this finishing action produces a result or a degreeof smoothness and finish which it has hitherto been impossible to attainexcept by separate and special treatment at considerable expense, andeven then it has been difficult or well-nigh impossible to secure suchfinish and at the same It will be found advisable to set the rollers 24and 27 .at suchangle as will correspond with the rate of travel of theslide 2 relative to the rate of rotation of the work. In other words,the rollers should have an inclination equal to the pitch of the threadthat would be traced upon the surface of the work bya.

toolcarried by the slide.

The device is commonly used with lathes to which theshafting is fedthrough an openhead-stock, and it is desirable that the roller orrollers or the yoke in which the roller is carried be so fashioned as topermit the work to enter freely. This may be accomplished by beveling orcurving the surface of the roll, as in Fig. 4, or by beveling the sidesof the yoke, as in Fig. 5.

While the set-screws 25 and 28 answer well to holdthe yoke stems orshanks, it is obvious that a split sleeve or sleeves 34 may be formed Aspring 32, car-.

in the lever 9 or 30 and provided with abinding screw or bolt 35, asshown in Fig. 6.

Blocks may be substituted for the rollers.

As above suggested, the roller bearing upon and held constantly againsta finished portion of the shaft follows it in all its vibrations andholds the finishing-tool always in the proper relation thereto, thewhole constituting a calipering device movable with the work, butmaintaining always the proper relation between the two arms of thecalipers or between the work and the tool.

The essential feature of the device is the combination of a cutting-toolon one side and a guide on the opposite side of the work connected onewith the other and so pivoted that the tool shall move in response to orin unison with the guide, the latter being keptin contact, with afinished surface of the work by a spring or its equivalent.

; The second rolleris desirable in the absence of a steady-rest capableof properly supporting the work, .but may be omitted when such rest isemployed.

, The device may be-fixed upon the bed of the lathe and the work bearranged to travel,

bjearing device at one side of the spindle-axis;

altool at the oppositeside thereof; a conneotion between the rest andthe tool whereby they are caused. to move .in unison; and .a

spring arranged to holdthe rest normally in contactwith the work in thelathe.

i 2. In combination with the tool-slide of a lathe, a tool holder orcarrier pivotally supported upon said slide, having a tool-support atoneside of the axis of the lathe-spindles, I and a roller at the oppositeside of said axis.

adapted to bear upon the work carried by the lathe, the tool-support andthe'roller being held in fixed relation to each other while the deviceis in operation.

; 3. In combination with the tool-slide of a lathe, a tool holder orcarrier pivotally supported upon said slide, having a tool-support atone side of the axis of thelathe-spindles, and rollers respectively atthe opposite side IIO of and above said axis adapted to bear upon I thework carried by the lathe, the tool-holder andv the rollers beingclamped and held in fijxed relation to each other preparatory tooperation of the device.

T4. In combination with the, bed of a lathe, atool-slide 2; means formoving said slide lengthwise of the lathe-bed; a frame or lever 9pivotallysupported upon said slide; a toolsupport carried by said. frameor lever; and bearing-rollers 24 and 27 also carried by said lever andserving to hold the tool against the 1 work between it and the rollers.

55. In combination with lathe-bed 1, toolslide 2; means for moving saidslide along the bed; frame or lever 9 pivotally supported upon said bed;a spring serving to rock the frame or lever forward upon its pivot; atoolholder carried by said frame; and cylindrical stems 22 and 26adjustably mounted in the frame or lever and provided at their innerends With rollers 24 and 27, substantially as described and shown.

6. The herein-described tool holder or carrier consisting of atool-slide 2; a lever or frame 9 pivotally supported thereon andprovided with tail or extension 10 a rod or stem 11 extending from saidtail through a flange or projection on the tool-slide and encircled by aspring 13; a nut or enlargement upon said stem beneath the spring; atool-slide adjustable upon the lever; a cylindrical stem movablehorizontally through the lever and carrying a bearing-roller 24 at therear of the 'vvorkj a cylindrical stem at the upper end of the rollercarrying a bearing-roller 27 above the Work; and binding-screws forsecuring said stems at the desired adjustments, sub-

